Synthesis of vitamin E catalyzed by [(C2H5)3NH]Cl/ZnCl2 ionic liquid

LUO Man; DU Jun; LIU Zuohua; FAN Xing; ZHOU Xiaoxia; TAO Changyuan

doi:10.11949/j.issn.0438-1157.20141011

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Synthesis of vitamin E catalyzed by [(C₂H₅)₃NH]Cl/ZnCl₂ ionic liquid

更新时间：2025-12-10

- Synthesis of vitamin E catalyzed by [(C₂H₅)₃NH]Cl/ZnCl₂ ionic liquid
- CIESC Journal Issue 1, Pages: 126-131(2015)
- 作者机构：
  
  1. 重庆大学化学化工学院,重庆,400044
  2. 第三军医大学化学教研室,重庆,400038
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141011
  CLC： TQ032.4}
- Online First：05 January 2015，
  
  Published：05 January 2015
- 稿件说明：
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LUO Man, DU Jun, LIU Zuohua, et al. Synthesis of vitamin E catalyzed by [(C₂H₅)₃NH]Cl/ZnCl₂ ionic liquid[J]. CIESC Journal, 2015, (1): 126-131. DOI: 10.11949/j.issn.0438-1157.20141011.
DOI：

LUO Man, DU Jun, LIU Zuohua, et al. Synthesis of vitamin E catalyzed by [(C₂H₅)₃NH]Cl/ZnCl₂ ionic liquid[J]. CIESC Journal, 2015, (1): 126-131. DOI: 10.11949/j.issn.0438-1157.20141011. DOI：

摘要

维生素E合成过程中催化剂用量大、损失严重且不能循环使用

后处理过程产生大量废液导致严重的环境问题。实验合成了几种Lewis酸性离子液体

并应用于维生素E合成。研究发现

[(C2H5)3NH]Cl/ZnCl2离子液体催化合成维生素E效果最好

该离子液体中无机阴离子起主要催化作用

季铵阳离子易与异植物醇的羟基形成氢键

能使异植物醇与主环发生定向缩合反应。采用FT-IR研究了[(C2H5)3NH]Cl/ZnCl2离子液体结构和酸性

并系统考察了其对维生素E合成的影响。随着ZnCl2摩尔分数增加

离子液体的Lewis酸性增强。在ZnCl2摩尔分数为0.66的[(C2H5)3NH]Cl/ZnCl2离子液体催化作用下

维生素E的产率可达到87.4%

该离子液体重复使用5次

催化性能没有明显下降。

Abstract

The main problems in the synthesis of vitamin E are large dosage and much loss of the catalyst

as well as difficulty to recycle the catalyst. There also exist serious environmental problems caused by contamination of water with the catalysts in the washing process. Several ionic liquids were synthesized to catalyze the synthesis of vitamin E. [(C2H5)3NH]Cl/ZnCl2 ionic liquid had the best catalytic performance. The inorganic anion in the ionic liquid played the major catalytic role

and the quaternary ammonium cation could form hydrogen bonds with isophytol easily

which enabled directed condensation reaction between isophytol and trimethylhydroquinone. The structure and acidity of [(C2H5)3NH]Cl/ZnCl2 ionic liquid were characterized by FT-IR

and its effect on production of vitamin E was investigated. With the increase of mole fraction of ZnCl2

the ionic liquid showed stronger acidity. When the mole fraction of ZnCl2 in ionic liquid was 0.66

yield of vitamin E could reach 87.4% under catalysis of [(C2H5)3NH]Cl/ZnCl2. The ionic liquid could be reused 5 times without significant decrease in catalytic performance.

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